A curmudgeon is a person who is often grumpy, irritable, or difficult to please. They may express their dissatisfaction with the world around them, frequently complaining about various aspects of life. This term is commonly used to describe someone who seems to have a negative outlook and is resistant to change or new ideas. Curmudgeons can be found in literature and popular culture, often portrayed as characters who are cantankerous yet sometimes endearing. Famous examples include Ebenezer Scrooge from Charles Dickens' "A Christmas Carol" and Oscar the Grouch from Sesame Street. Despite their gruff demeanor, curmudgeons can sometimes reveal a softer side.